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Regular nonwoven medical masks have 3 layers with different uses. The outer layer has waterproof properties, effectively preventing the liquid particles from being splashed when the patient sneezes, coughs, breathes hard ... The outside surface is usually light blue to distinguish easily. The inner layer is always white, very easy to distinguish from the outer layer. The face of the cloth turns inwards, close to the skin of the face, so it must be pure and smooth, without fiber fibers causing discomfort. In addition, it must be waterproof to sweat to create comfort for the user. The middle layer prevents particles from splashing and must filter dust and bacteria. This is the layer that determines the quality of the mask. A "right" layer of filter must allow air to pass easily, creating a sense of ventilation for the user, but must have a structure sufficient to filter out extremely small particles of bacteria and dust. Conventional nonwoven fabric has 3 layers with different uses. The outer layer has waterproof properties, effectively preventing the liquid particles from being splashed when the patient sneezes, coughs, breathes hard ... The outside surface is usually light blue to distinguish easily.
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